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compounded = product
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sub-duplicate = squareroot
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duplicate = squared
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triplicate = cube

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here ratio is for the number of coins and not values

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things to look for
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difference in the income and expense ratio is same
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their savings must be same as well
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only then you can use the trick below
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here they asking A's salary
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here difference is one so
1u=500
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using this we can get anything
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things to look for
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difference in the income and expense ratio is same
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their savings aint gonna be same
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here they asking B's salary
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here we do 5∗4−6∗3=2u for lhs
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here for we do 4∗1800−3∗1600 for rhs
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finally you have
2u=2400
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hence you have 1 unit as 1200
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things to look for
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difference in the income and expense ration is different
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their savings is same
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here they asking B's salary
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make the difference the ratio's numerator and denominator as same
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here 2 is multiplied for income ratio cuz it is the lcm of 3−2 and 5−3m and TOTALLY discard the previous ratio
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yo answer is 1500∗4=6000

- see here the difference between new ratio and the age differnce is same so just add the 12 to initial ratio.
leaving and joining

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here ratio is for previous and new.
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try to go according to the root formula of things.
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like here total labpor income is your formula